Telephone cut-off.



@hm cones Y ELAS. GILBERT W6, Fr BRAKE.

` TELEPHONE GUT-OFP. lAPPLIUAIIONIILIID 00TE 26,1907.

99,1524l n Patentea-sept.29,19os.

(9 d r Mzzmma/fg,

cierren HENRY s. GILBERT .Be it known that We, HENK and WILLIAM F.DRAKE, citizeiisothe United This invention has referen States, residingat Pueblo, inthe-county oiy Pueblo, State of'Coloradmghaveinvented newanduseful Telephone 4(lut-Ggf, of i'zvhieh' the following is aspecification.

ments in telephoneeut frogs?" object is to provide `meansl whereindisturbmg noises produced iii-thelocalre local transmitter are entirelycu linf-orclimi; nated. v' j The invention comprises an" attachmentwhich may be vap 4lied ltd o r'id s'conIrect'edI'4 from an ordinary teephone-set Without iii any manner disturbing or modifying-'the comstruction of the instrument, and.-whi ch may be operated at willbfthehand of the user holding the receiver, e

The invention position t-o b eo erated byfone ofthe fin-gers .of thehand 'ho ding .the,receiver, an'd-v fromA this sw-itch, mechanism a pairof conductors' are led to the transmitter wherelone 4of theyconductorsis sulplied with ,a sui'tableterini? nal for fitting un er oneofthe casingscrews While the other end is` rovided with a similarterminal and' a cli w ich Ainaybe(appliedto the end ofthe con' uctorleading into. thecas-- in of the transmitter through the .usualinsuating sleeve.- Bythis meansifthe switch, f "when closed, bridges themicrophonic -ele` ment and so eliminates its eec't upon the? j line,A sothat whenfa person .is 'listening at the receiver there' are nodisturbing noises due to the vaction of thelloca'l transmitter, whichnoises are particularly 4obtrusive in situa- OBS where ther'eareconsiderahleeextraneous noises. -A

' The' 'invention l'willibe'* liest understood by'.LA

the consideration of the following detail de- =iicription7 .taken `inconnection withv thekacdrawings forming. part'V of. this;A

ompanyllg specification, in which drawings',

The figure lshows ,so .much of telephone set as is necessary forthevunderstandlng of l the invention, with the-attachment constitutingthe invention appliedthereto vand'hanfing parts shown insect1on. 4Referring to the drawing, there. is shown a transmitter 1.v ofa typecommonly employed' @reafirmaterreinen#we retain auf 'die suai 'typen"eilig @desata 'tia n "dances, tliere'is' usually,awntirnioiisliiuzzingy l disturbance-111 the receiver,` o'niong 'distance `wer-- by, the

aving` -the otherhand' icrninpiises, essentiallv, a switch mechanismwhich may be'japplied dif" rectly to the hearing 'end' of' the'receverin these partsareto remain as installedorigi# nallyWithoi'tchangeor modification `ofany telephonel circuits; which istdistracting' to many-people 'and-,i4 ijfercs with 'the-frecepff, ..11tion' ofthe message (lint attachment is dee. si neri to overcor'ne 'thisobjectionable feature microphone element 'when the-user of the-tele-' Li phoneis receiving alnessage and. thereby eliminating all theextraneous i'ioiseejimpressed upon the linethrough the .local transe .finitterz Hso v that the receiving of tlieinessage is 'clarified' and'the line beconiess quiet as in'.

'the uietesftfpiice' or' booth,"'even'.when the i Our invention' compShrew which pass '.through the 1i{sul-atnig niate'l'iai..

and then through the leg ofthe metal vclip and ultimately bearagainstnne side of the squarciagbead surroundingthe ear piece-oftheref-b ceive'r. .Thevother legfof the 'clip 3 engages the other sideof-jt'he 'square bead 6 so'that `whenthe screws 5A are-properlyvset)thjislip* is made vfast tothe lhearing endA of the re- 9o" I ceiver.'The 'block 4 extendsfbeyondffthe bridge `piece of .the clip andltherecar/ries one end .of an elastic plate; 7 by means of screws 1. 7 whichlatter, however, simply ext'end into but not through'v the bloclie.'f'The @plate 7 is sufficiently elastic, iso'lt that by pressing-u* uponits free-endit-inay' b elrought into rcon-- tact with Vclip 3., There-isprovided a ends `of tliejc'gnductors at one end off the cord have'sec11'red Lto' thenirtnotched terminal plates 9:byme'ans'offwhich theconductors screws 5 and 7?' The,other end' .of the cord .S has Sits-conductofsjirovided .with like "ter mina; plates ,10, oneefwhichiseonnected to.

the' 'case of -the'tralnsinittei by.' one v of the screws -11 used toiastenthe parts together, 11o

while the other terminal is connected to a clip 12 embracing the usualmetallic ferrule 13 formed on the end et the conductor 14 coming fromthe microphone element, and which ferrule is protected by an insulatingsleeve 15 from contact with the casing of the transmitter. A screw 16 isprovided for clamping theclip 12 upon the ferrule 13 and likewisesecuring the corresponding terminal 10 to said clip.

The block 4insulates the s ring plate 7 from the clip 3, but when tieplate is moved into contact with 'the clip 3, hen there is a circuitestablished around the microphone element by means of the condu'cF torsin the cord 8, this circuit being ot' practically negligible resistance,so that the ac-4 tion of the lmicrophone element is clicked oti` andlost. Now, let it be supposed that a telephone set is in a noisylocation and that a user is endeavoring to receive a message. Thereceiver is held to the ear in the usual manner, but, when the message1s being received', a linger of the hand holding the receiver is pressedupon the plate 7 until it makes contact with the clip 3. The microphoneelement thus being cut out of the circuit is, of course, inactive, andall noises or'- dinarily produced thereby upon the line are eliminated,so that the received message is free from all buzzing, from the causesstated, and'all disturbance is thereby obliterated.

. When the user desires to speak into the transrnitter, then the Ylingeris lifted. from the plate` ends of said conductors lor attaching them4to the termiiials of the microphone element oi the transmitter. 1

A telephone attachment con'iprising a clip adapted to embrace the headat the hea1`- ing end of a telephone receiver, an insulating blockcarried by saidrlip, a spring plate carried by said inrnilating` blockand4 movable into and out of' electrical contact with the clip, a pairof c(nulnctoris` connected at one end to the clip and plate respectivelyand at the other end beiner adapted to he .connected tothe tern'iinalsot' the microphone element of the transmitter.

3. A telephone attachment comprising a clip adapted to embrace the beadat the hearing end ot' a telephone receiver, an insulating block carriedby said clip, a springl plate wir ried by said insulatingr block andmovable into and out of electrical contact. with the clip, a pair otconductors connected at one end to the clip and plate respectively, aterminal plate at the end ot one ot the conductors adapted to be engagedby a screw electrically connected to one terminal ot the micro )honeelement, and a plate and clip at the enti'vof the other conductoradapted to engage a part in electrical connection with the otherterminal ot the microphonic element.

ln testimony that we claim the foregoing as our own, we have heretoafl'ixed our signa tures in the presence of two witnesses.

lllCXl'A S. tlldlllll'l. Yv'llddnhl. l?. lllAlilC. Vitnesses:

FRANK A. ltlnnnu, LnsL-in C. VNAnsoALE.

